Great for hydroponics

fish health)

Laboratory research & quality control testing

Simply insert the probe and injection valve in-line with your recirculation pump

For daily storage: Place your pH or ORP electrode in a small glass filled with HI70300G solution

GroLine 5000 uS/cm Conductivity Standard Sachets, 20 mL (10 -Packs) NIST traceable conductivity standard Great for hydroponicsHI70039 10 packs is a high quality 5000 uS cm conductivity standard designed with hydroponics, aquaponics, and greenhouses in mind. Single use sachets are highly portable, with a small footprint and a lightweight design. They are the perfect accessory for your on the go testing, fitting easily into your pocket or carrying case. Supplied with Certificate of Analysis Single use sachets for convenience. Perfect for use with GroLine testers and portable